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:: Volume 11, Issue 37 (7-2017) ::
jwmseir 2017, 11(37): 85-88 Back to browse issues page
Peak flow estimation in ungauged catchments using flow index
Jamal Mosaffaie Dr. , Hossein Malekinezhad Dr
Assistant Professor Soil Conservation and Watershed Management Research Institute, Tehran
Abstract:   (1796 Views)

In regional flood frequency analysis, instead of using the data from a single station, it considers the data and characteristics of a group of similar stations. This study was done in Qazvin province and is based on linear momentum that Hosking and Wallis are provided this method as a new approach to flood frequency analysis. The results of factor analysis showed that perimeter, equivalent diameter, time of concentration, length of main waterway and area were the main variables affected flood magnitude. Based on cluster analysis and using the factors affected flood peak, the remaining 15 stations, were divided into two homogenous regions. Homogeneity of these two regions was confirmed using homogeneity test of L-moments. Based on the best-fit criteria of Zdist, GNO distribution is the best fit for the entire region but for one and two homogeneous regions, GLO and GPA distributions were the best fit respectively. Parameter values for each of the selected distributions were calculated using linear moments and discharges with different return periods was estimated using the best regional distribution for all stations. Finally, after drawing of growth curves, the regression relation between average discharges and watershed areas were obtained at each region. Based on these relationships, at ungauged locations, peak discharges can be estimated using index flood method for different recurrence interval.

Keywords: Region flood analysis, L-moments, Cluster analysis, Annual maximum flood, Qazvin province.
Full-Text [PDF 478 kb]   (443 Downloads)    
Type of Study: Research | Subject: Special
Received: 2013/03/12 | Accepted: 2014/02/18 | Published: 2017/06/28
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mosaffaie J, malekinezhad H. Peak flow estimation in ungauged catchments using flow index. jwmseir. 2017; 11 (37) :85-88
URL: http://jwmsei.ir/article-1-161-en.html

Volume 11, Issue 37 (7-2017) Back to browse issues page
مجله علوم ومهندسی آبخیزداری ایران Iranian Journal of Watershed Management Science and Engineering
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